diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/common/strlib.c | 337 | ||||
| -rw-r--r-- | src/common/strlib.h | 36 |
2 files changed, 373 insertions, 0 deletions
diff --git a/src/common/strlib.c b/src/common/strlib.c index db47c969b..da1fddd8c 100644 --- a/src/common/strlib.c +++ b/src/common/strlib.c @@ -3,6 +3,7 @@ #include "../common/cbasetypes.h" #include "../common/malloc.h" +#include "../common/showmsg.h" #include "strlib.h" #include <stdio.h> @@ -362,6 +363,342 @@ int strline(const char* str, size_t pos) return line; } + + +///////////////////////////////////////////////////////////////////// +/// Parses a delim-separated string. +/// Starts parsing at startoff and fills the out_pos array with the start and +/// end positions in the string of the line and fields (that fit the array). +/// Returns the number of fields or -1 if an error occurs. +/// +/// out_pos can be NULL. +/// Positions out_pos[0] and out_pos[1] are for the line start and end +/// positions. If a line terminator is found, the end position is placed there. +/// The next values of the array are the start and end positions of the fields. +/// out_pos[2] and out_pos[3] for the first field, out_pos[4] and out_pos[5] +/// for the seconds field and so on. +/// Unfilled positions are set to -1. +/// +/// @param str String to parse +/// @param len Length of the string +/// @param startoff Where to start parsing +/// @param delim Field delimiter +/// @parem out_pos Array of resulting positions +/// @param npos Size of the pos array +/// @param opt Options that determine the parsing behaviour +/// @return Number of fields in the string or -1 if an error occured +int sv_parse(const char* str, int len, int startoff, char delim, int* out_pos, int npos, enum e_svopt opt) +{ + int i; + int count; + enum { + START_OF_FIELD, + PARSING_FIELD, + PARSING_C_ESCAPE, + END_OF_FIELD, + TERMINATE, + END + } state; + + // check pos/npos + if( out_pos == NULL ) npos = 0; + for( i = 0; i < npos; ++i ) + out_pos[i] = -1; + + // check opt + if( delim == '\n' && (opt&(SV_TERMINATE_CRLF|SV_TERMINATE_LF)) ) + { + ShowError("sv_parse: delimiter '\\n' is not compatible with options SV_TERMINATE_LF or SV_TERMINATE_CRLF.\n"); + return -1;// error + } + if( delim == '\r' && (opt&(SV_TERMINATE_CRLF|SV_TERMINATE_CR)) ) + { + ShowError("sv_parse: delimiter '\\r' is not compatible with options SV_TERMINATE_CR or SV_TERMINATE_CRLF.\n"); + return -1;// error + } + + // check str + if( str == NULL ) + return 0;// nothing to parse + +#define IS_END() ( i >= len ) +#define IS_DELIM() ( str[i] == delim ) +#define IS_TERMINATOR() ( \ + ((opt&SV_TERMINATE_LF) && str[i] == '\n') || \ + ((opt&SV_TERMINATE_CR) && str[i] == '\r') || \ + ((opt&SV_TERMINATE_CRLF) && i+1 < len && str[i] == '\r' && str[i+1] == '\n') ) +#define IS_C_ESCAPE() ( (opt&SV_ESCAPE_C) && str[i] == '\\' ) +#define SET_FIELD_START() if( npos > count*2+2 ) out_pos[count*2+2] = i +#define SET_FIELD_END() if( npos > count*2+3 ) out_pos[count*2+3] = i; ++count + + i = startoff; + count = 0; + state = START_OF_FIELD; + if( npos > 0 ) out_pos[0] = startoff;// start + while( state != END ) + { + if( npos > 1 ) out_pos[1] = i;// end + switch( state ) + { + case START_OF_FIELD:// record start of field and start parsing it + SET_FIELD_START(); + state = PARSING_FIELD; + break; + + case PARSING_FIELD:// skip field character + if( IS_END() || IS_DELIM() || IS_TERMINATOR() ) + state = END_OF_FIELD; + else if( IS_C_ESCAPE() ) + state = PARSING_C_ESCAPE; + else + ++i;// normal character + break; + + case PARSING_C_ESCAPE:// skip escape sequence (validates it too) + { + ++i;// '\\' + if( IS_END() ) + { + ShowError("sv_parse: empty escape sequence\n"); + return -1; + } + if( str[i] == 'x' ) + {// hex escape + ++i;// 'x' + if( IS_END() || !ISXDIGIT(str[i]) ) + { + ShowError("sv_parse: \\x with no following hex digits\n"); + return -1; + } + do{ + ++i;// hex digit + }while( !IS_END() && ISXDIGIT(str[i])); + } + else if( str[i] == '0' || str[i] == '1' || str[i] == '2' ) + {// octal escape + ++i;// octal digit + if( !IS_END() && str[i] >= '0' && str[i] <= '7' ) + ++i;// octal digit + if( !IS_END() && str[i] >= '0' && str[i] <= '7' ) + ++i;// octal digit + } + else if( strchr(SV_ESCAPE_C_SUPPORTED, str[i]) ) + {// supported escape character + ++i; + } + else + { + ShowError("sv_parse: unknown escape sequence \\%c\n", str[i]); + return -1; + } + state = PARSING_FIELD; + break; + } + + case END_OF_FIELD:// record end of field and continue + SET_FIELD_END(); + if( IS_END() ) + state = END; + else if( IS_DELIM() ) + { + ++i;// delim + state = START_OF_FIELD; + } + else if( IS_TERMINATOR() ) + state = TERMINATE; + else + state = START_OF_FIELD; + break; + + case TERMINATE: +#if 0 + // skip line terminator + if( (opt&SV_TERMINATE_CRLF) && i+1 < len && str[i] == '\r' && str[i+1] == '\n' ) + i += 2;// CRLF + else + ++i;// CR or LF +#endif + state = END; + break; + } + } + +#undef IS_END +#undef IS_DELIM +#undef IS_TERMINATOR +#undef IS_C_ESCAPE +#undef SET_FIELD_START +#undef SET_FIELD_END + + return count; +} + +/// Escapes src to out_dest according to the format of the C compiler. +/// Returns the length of the escaped string. +/// out_dest should be len*4+1 in size. +/// +/// @param out_dest Destination buffer +/// @param src Source string +/// @param len Length of the source string +/// @param escapes Extra characters to be escaped +/// @return Length of the escaped string +size_t sv_escape_c(char* out_dest, const char* src, size_t len, const char* escapes) +{ + size_t i; + size_t j; + + if( out_dest == NULL ) + return 0;// nothing to do + if( src == NULL ) + {// nothing to escape + *out_dest = 0; + return 0; + } + if( escapes == NULL ) + escapes = ""; + + for( i = 0, j = 0; i < len; ++i ) + { + switch( src[i] ) + { + case '\0':// octal 0 + out_dest[j++] = '\\'; + out_dest[j++] = '0'; + out_dest[j++] = '0'; + out_dest[j++] = '0'; + break; + case '\r':// carriage return + out_dest[j++] = '\\'; + out_dest[j++] = 'r'; + break; + case '\n':// line feed + out_dest[j++] = '\\'; + out_dest[j++] = 'n'; + break; + case '\\':// escape character + out_dest[j++] = '\\'; + out_dest[j++] = '\\'; + break; + default: + if( strchr(escapes,src[i]) ) + {// escapes to octal + out_dest[j++] = '\\'; + out_dest[j++] = '0'+((char)(((unsigned char)src[i]&0700)>>6)); + out_dest[j++] = '0'+((char)(((unsigned char)src[i]&0070)>>3)); + out_dest[j++] = '0'+((char)(((unsigned char)src[i]&0007) )); + } + else + out_dest[j++] = src[i]; + break; + } + } + out_dest[j] = 0; + return j; +} + +/// Unescapes src to out_dest according to the format of the C compiler. +/// Returns the length of the unescaped string. +/// out_dest should be len+1 in size and can be the same buffer as src. +/// +/// @param out_dest Destination buffer +/// @param src Source string +/// @param len Length of the source string +/// @return Length of the escaped string +size_t sv_unescape_c(char* out_dest, const char* src, size_t len) +{ + static unsigned char low2hex[256] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0x0? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0x1? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0x2? + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0,// 0x3? + 0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0x4? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0x5? + 0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0x6? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0x7? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0x8? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0x9? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0xA? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0xB? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0xC? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0xD? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// 0xE? + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 // 0xF? + }; + size_t i; + size_t j; + + for( i = 0, j = 0; i < len; ) + { + if( src[i] == '\\' ) + { + ++i;// '\\' + if( i >= len ) + ShowWarning("sv_unescape_c: empty escape sequence\n"); + else if( src[i] == 'x' ) + {// hex escape sequence + unsigned char c = 0; + unsigned char inrange = 1; + + ++i;// 'x' + if( i >= len || !ISXDIGIT(src[i]) ) + { + ShowWarning("sv_unescape_c: \\x with no following hex digits\n"); + continue; + } + do{ + if( c > 0x0F && inrange ) + { + ShowWarning("sv_unescape_c: hex escape sequence out of range\n"); + inrange = 0; + } + c = (c<<8)|low2hex[(unsigned char)src[i++]];// hex digit + }while( i >= len || !ISXDIGIT(src[i]) ); + out_dest[j++] = (char)c; + } + else if( src[i] == '0' || src[i] == '1' || src[i] == '2' || src[i] == '3' ) + {// octal escape sequence (255=0377) + unsigned char c = src[i]-'0'; + ++i;// '0', '1', '2' or '3' + if( i < len && src[i] >= '0' && src[i] <= '9' ) + { + c = (c<<3)|(src[i]-'0'); + ++i;// octal digit + } + if( i < len && src[i] >= '0' && src[i] <= '9' ) + { + c = (c<<3)|(src[i]-'0'); + ++i;// octal digit + } + out_dest[j++] = (char)c; + } + else + {// other escape sequence + if( strchr(SV_ESCAPE_C_SUPPORTED, src[i]) == NULL ) + ShowWarning("sv_parse: unknown escape sequence \\%c\n", src[i]); + switch( src[i] ) + { + case 'a': out_dest[j++] = '\a'; break; + case 'b': out_dest[j++] = '\b'; break; + case 't': out_dest[j++] = '\t'; break; + case 'n': out_dest[j++] = '\n'; break; + case 'v': out_dest[j++] = '\v'; break; + case 'f': out_dest[j++] = '\f'; break; + case 'r': out_dest[j++] = '\r'; break; + case '?': out_dest[j++] = '\?'; break; + default: out_dest[j++] = src[i]; break; + } + ++i;// escaped character + } + } + else + out_dest[j++] = src[i++];// normal character + } + out_dest[j] = 0; + return j; +} + + + ///////////////////////////////////////////////////////////////////// // StringBuf - dynamic string // diff --git a/src/common/strlib.h b/src/common/strlib.h index 31e364e2a..d1fb20d49 100644 --- a/src/common/strlib.h +++ b/src/common/strlib.h @@ -46,6 +46,42 @@ int safesnprintf(char* buf, size_t sz, const char* fmt, ...); /// Lines start at 1. int strline(const char* str, size_t pos); + + +/// Bitfield determining the behaviour of sv_parse. +enum e_svopt +{ + // default: no escapes and no line terminator + SV_NOESCAPE_NOTERMINATE = 0, + // Escapes according to the C compiler. + SV_ESCAPE_C = 1, + // Line terminators + SV_TERMINATE_LF = 2, + SV_TERMINATE_CRLF = 4, + SV_TERMINATE_CR = 8, +}; + +/// Other escape sequences supported by the C compiler. +#define SV_ESCAPE_C_SUPPORTED "abtnvfr\?\"'\\" + +/// Parses a delim-separated string. +/// Starts parsing at startoff and fills the pos array with the start and end +/// positions in the string of the line and fields (that fit the array). +/// Returns the number of fields or -1 if an error occurs. +int sv_parse(const char* str, int len, int startoff, char delim, int* out_pos, int npos, enum e_svopt opt); + +/// Escapes src to out_dest according to the format of the C compiler. +/// Returns the length of the escaped string. +/// out_dest should be len*4+1 in size. +size_t sv_escape_c(char* out_dest, const char* src, size_t len, const char* escapes); + +/// Unescapes src to out_dest according to the format of the C compiler. +/// Returns the length of the unescaped string. +/// out_dest should be len+1 in size and can be the same buffer as src. +size_t sv_unescape_c(char* out_dest, const char* src, size_t len); + + + /// StringBuf - dynamic string struct StringBuf { |